Patents Assigned to TPR Co, Ltd.
  • Patent number: 11499498
    Abstract: A cylinder liner of the present invention is a cylinder liner mounted on a cylinder block and formed of flaky graphite cast iron, at least a nitrided layer is provided on an inner periphery of the cylinder liner, and a cross hatching section is formed on the inner periphery, a roughness curve of the inner periphery has a plateau honing shape, a ten-point average roughness Rz of the inner periphery pursuant to JIS B0601:1982 is 4.0 ?m or less, and an average value of an area ratio of pits generated in the inner periphery is 8% or less.
    Type: Grant
    Filed: July 23, 2019
    Date of Patent: November 15, 2022
    Assignees: TPR CO., LTD., TPR INDUSTRY CO., LTD.
    Inventors: Yuki Kuromasa, Koichi Hatakeyama, Takashi Ozawa
  • Patent number: 11460073
    Abstract: Oil grooves (40) formed in at least one of surfaces of a ring-shaped member (30) each have a longitudinal direction that forms an angle falling within a range of from 40 degrees to 75 degrees with respect to a radial direction of the ring-shaped member, and are arranged at equal intervals in a circumferential direction of the ring-shaped member (30). The oil grooves (40) include communicating oil grooves (40A) and non-communicating oil grooves (40B) formed to extend to the vicinity of an outer peripheral end (34), and are arranged with periodic regularity in the circumferential direction of the ring-shaped member (30). In addition, a communicating oil groove area ratio expressed by Expression: “S1/(S1+S2)” falls within a range of from 0.15 to 0.85, where S1 represents a sum of plane areas of the communicating oil grooves (40A), S2 represents a sum of the non-communicating oil grooves (40B).
    Type: Grant
    Filed: August 24, 2021
    Date of Patent: October 4, 2022
    Assignee: TPR CO., LTD.
    Inventors: Hideyoshi Noguchi, Yasuyuki Yokoyama
  • Patent number: 11396907
    Abstract: A thrust washer is provided with a ring-shaped portion that surrounds an insertion hole, the thrust washer is provided with a sliding surface and an oil groove configured to allow lubricating oil to flow in, the oil groove is provided with an opening portion configured to allow the lubricating oil to flow in from the insertion hole side in an inner peripheral end side, an outer periphery end side of the ring-shaped portion of at least one of the oil groove is provided with an oil stop wall which is configured to suppress flow of the lubricating oil toward an outer periphery side of the ring-shaped portion, and a sliding area ratio of each of the sliding surfaces to a projection plane in plan view of the ring-shaped portion is provided within a range of from 60% to 85%
    Type: Grant
    Filed: December 13, 2019
    Date of Patent: July 26, 2022
    Assignee: TPR CO., LTD.
    Inventors: Masaki Ikeda, Shuichirou Hamanaka
  • Publication number: 20220213928
    Abstract: Oil grooves (40) formed in at least one of surfaces of a ring-shaped member (30) each have a longitudinal direction that forms an angle falling within a range of from 40 degrees to 75 degrees with respect to a radial direction of the ring-shaped member, and are arranged at equal intervals in a circumferential direction of the ring-shaped member (30). The oil grooves (40) include communicating oil grooves (40A) and non-communicating oil grooves (40B) formed to extend to the vicinity of an outer peripheral end (34), and are arranged with periodic regularity in the circumferential direction of the ring-shaped member (30). In addition, a communicating oil groove area ratio expressed by Expression: “S1/(S1+S2)” falls within a range of from 0.15 to 0.85, where S1 represents a sum of plane areas of the communicating oil grooves (40A), S2 represents a sum of the non-communicating oil grooves (40B).
    Type: Application
    Filed: August 24, 2021
    Publication date: July 7, 2022
    Applicant: TPR CO., LTD.
    Inventors: Hideyoshi NOGUCHI, Yasuyuki YOKOYAMA
  • Patent number: 11320049
    Abstract: In this piston ring combination, a second outer peripheral surface, which is the outer peripheral surface of a second ring, has a second protruding surface curved into a convex shape, and a pair of third outer peripheral surfaces, which are the outer peripheral surfaces of a pair of segments, each have a third outer peripheral area in which a third protruding surface is formed, the third protruding surfaces being curved into convex shapes. In at least one of the pair of third outer peripheral surfaces, the peripheral edge on a crank-chamber side is positioned farther outward in the diametrical direction than the peripheral edge on a combustion-chamber side, and a peak of the third protruding surface is positioned nearer to the crank chamber than the center of the third outer peripheral surface.
    Type: Grant
    Filed: October 28, 2019
    Date of Patent: May 3, 2022
    Assignee: TPR Co., Ltd.
    Inventor: Tetsuya Nango
  • Patent number: 11305997
    Abstract: Applicability to a composite material with high purity and high strength, and a material requiring high conductivity or high thermal conductivity is enhanced. The present invention relates to a multi-walled carbon nanotube having two or more tubes of a graphene sheet where carbon atoms are arranged in a hexagonal honeycomb form, coaxially, wherein a diameter of an outermost wall based on observation of an image by a transmission electron microscope is 3 nm or more and 15 nm or less, and a length based on observation of an image of a scanning electron microscope is 1.0 mm or more, an aggregate of multi-walled carbon nanotubes and a method for preparing the multi-walled carbon nanotube.
    Type: Grant
    Filed: April 16, 2020
    Date of Patent: April 19, 2022
    Assignee: TPR CO., LTD.
    Inventors: Toshiaki Shimizu, Shinpei Teshima, Yasuhiko Okamura, Yusuke Kawaguchi, Kazuki Otomo, Yuta Koguchi, Katsuhito Suzuki, Yoshio Bando
  • Publication number: 20220056949
    Abstract: A thrust washer is provided with a ring-shaped portion that surrounds an insertion hole, the thrust washer is provided with a sliding surface and an oil groove configured to allow lubricating oil to flow in, the oil groove is provided with an opening portion configured to allow the lubricating oil to flow in from the insertion hole side in an inner peripheral end side, an outer periphery end side of the ring-shaped portion of at least one of the oil groove is provided with an oil stop wall which is configured to suppress flow of the lubricating oil toward an outer periphery side of the ring-shaped portion, and a sliding area ratio of each of the sliding surfaces to a projection plane in plan view of the ring-shaped portion is provided within a range of from 60% to 85%
    Type: Application
    Filed: December 13, 2019
    Publication date: February 24, 2022
    Applicant: TPR CO., LTD.
    Inventors: Masaki IKEDA, Shuichirou HAMANAKA
  • Patent number: 11242929
    Abstract: The present invention addresses the problem of providing a piston ring covered with a DLC coating that has excellent wear resistance and shows a low attacking property on a cylinder bore sliding surface. The problem is solved by a piston ring which is used in the presence of an engine lubricating oil and includes a DLC coating on an outer peripheral sliding surface. The DLC coating has an sp2 component ratio of 0.5 to 0.85 as determined from a TEM-EELS spectrum obtained by a combination of a transmission electron microscope (TEM) and electron energy loss spectroscopy (EELS), as well as a coating hardness of 12 GPa to 26 GPa and a Young's modulus of 250 GPa or less as measured by a nanoindentation method.
    Type: Grant
    Filed: June 13, 2019
    Date of Patent: February 8, 2022
    Assignee: TPR Co., Ltd.
    Inventors: Tomoyuki Sato, Yutaka Kitazume, Takatsugu Iwashita
  • Patent number: 11223048
    Abstract: An aspect of the present invention provides a binder which makes it possible to obtain an electrode excellent in heat resistance. The binder contains: a re-emulsifiable resin powder coated with inorganic particles; and a metal-crosslinking thickening agent forming a hydrophobic gel by being crosslinked, in an aqueous system, via metal ions derived from an electrode active material.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: January 11, 2022
    Assignees: TPR CO., LTD., iElectrolyte CO., LTD.
    Inventors: Kazunari Soeda, Takuya Takahashi
  • Patent number: 11180857
    Abstract: A method for producing a porous member, whereby a member having smaller microgaps can be produced, and additionally, the outermost surface alone can be made porous and a porous layer can be formed on the surface while maintaining the characteristics of portions in which no porous layer is formed, is provided.
    Type: Grant
    Filed: January 16, 2017
    Date of Patent: November 23, 2021
    Assignees: TOHOKU TECHNO ARCH CO., LTD., TPR CO., LTD.
    Inventors: Takeshi Wada, Hidemi Kato
  • Patent number: 11168642
    Abstract: The present invention addresses the problem of providing a cylinder liner for insert casting, with which the bonding strength between a cylinder liner and a cylinder block can be improved by reducing voids generated on the cylinder block. The problem is solved by a cylinder liner for insert casting which includes plural projections on its outer peripheral surface and satisfies the following (i) and (ii): (i) the number of the projections is 5 to 50 per 1 cm2 on the outer peripheral surface, and (ii) when two 15.2 mm×0.03 mm lines are set in parallel with a gap of 3.8 mm therebetween at an arbitrary position on the outer peripheral surface of the cylinder liner, the total number of projections that are in contact with the two lines is 8 or less.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: November 9, 2021
    Assignees: TPR Co., Ltd., IPR Industry Co., Ltd.
    Inventors: Koichi Hatakeyama, Tomoki Takiguchi, Yoshihiko Aoki, Yuusuke Okuyama, Mako Abe
  • Patent number: 11141783
    Abstract: An object of the present invention is to provide a cylinder liner for insert casting that can improve the joining strength between a cylinder liner and a cylinder block by reducing voids generated between the cylinder liner and the cylinder block. The above-described problem can be solved when the molten metal running index YI defined by the following Formula (1) is from 2.2 to 14.5. Molten metal running index YI=[area ratio St (%) of top portions of protrusions×molten metal infiltration volume V (mm3)/surface area A (mm2) of cylinder liner base]/average surface-to-surface distance Pav between top portions of protrusions (mm)??(1).
    Type: Grant
    Filed: May 3, 2021
    Date of Patent: October 12, 2021
    Assignees: TPR Co., Ltd., IPR Industry Co., Ltd.
    Inventors: Yasutomo Tokairin, Koichi Hatakeyama, Kiyoyuki Kawai
  • Patent number: 11047333
    Abstract: A cylinder liner that is casted in a block and defines a cylinder bore for one cylinder includes: a cylindrical liner body; a projection part including a plurality of projections on an outer peripheral surface of a part of the liner body; and a bore adjacent part inclined at a predetermined angle to an axial direction of the body and extending in the inclination direction, at a predetermined part between an upper side end and a lower side end of the body, of the outer peripheral surface of the body, which faces another cylinder bore to be adjacent when casted in the block. The outer peripheral surface of the bore adjacent part is positioned more on an inner side of the body than the outer peripheral surface above and below, and is formed such that the projections are absent on at least a part of the outer peripheral surface.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: June 29, 2021
    Assignees: TPR Co., Ltd., TPR Industry Co., Ltd.
    Inventors: Akira Sato, Koichi Hatakeyama
  • Patent number: 10907570
    Abstract: To provide a cast iron cylindrical member capable of improving the bonding strength when metal on the outer peripheral side and the cast iron cylindrical member are integrated. For this objective, in a cast iron cylindrical member including a plurality of projections including constricted projections on the outer peripheral surface, the anchor portion index (I) represented by {(Aav2?Bav2)×?/4×Pn×Pr/100}×0.35H/2 is set in a specific range.
    Type: Grant
    Filed: December 12, 2018
    Date of Patent: February 2, 2021
    Assignees: TPR Co., Ltd., TPR Industry Co., Ltd.
    Inventors: Akira Sato, Takashi Sato, Mako Abe
  • Patent number: 10890255
    Abstract: Under a state in which the combination oil ring is mounted in an oil ring groove before inserted into a cylinder bore, when an inclined surface of an upper ear portion of an expander spacer is held in contact with an inner peripheral surface of an upper segment and an inclined surface of a lower ear portion of the expander spacer is held in contact with an inner peripheral surface of a lower segment, an upper protrusion amount (P1) from an outer peripheral-side end surface of the expander spacer to an outer peripheral surface vertex of the upper segment is larger than a lower protrusion amount (P2) from the outer peripheral-side end surface of the expander spacer to an outer peripheral surface vertex of the lower segment. When the combination oil ring is inserted into the cylinder bore, the sealing performance can be improved to reduce the oil consumption.
    Type: Grant
    Filed: July 30, 2018
    Date of Patent: January 12, 2021
    Assignee: TPR CO., LTD.
    Inventors: Seeroku Hoshino, Hirofumi Osada, Seiji Tamaki
  • Patent number: 10876494
    Abstract: A cylinder liner that is casted in a block and defines a cylinder bore corresponding to one cylinder includes: a cylindrical liner body; a projection part provided so as to include a plurality of projections on an outer peripheral surface of a part of the liner body; and a bore adjacent part formed such that the outer peripheral surface at an upper side end of the liner body is positioned more on an inner side of the liner body than the outer peripheral surface below the upper side end, and the projections are absent on at least a part of the outer peripheral surface at the upper side end, in a predetermined range of the outer peripheral surface of the liner body, which faces another cylinder bore to be adjacent when casted in the block.
    Type: Grant
    Filed: August 21, 2019
    Date of Patent: December 29, 2020
    Assignees: TPR Co., Ltd., TPR Industry Co., Ltd.
    Inventors: Akira Sato, Koichi Hatakeyama
  • Patent number: 10837399
    Abstract: Provided are a method of manufacturing an engine, an engine, and a connected cylinder. The method of manufacturing an engine includes at least a fitting step of fitting a connected cylinder to a hollow portion of a cylinder block main body. The connected cylinder is (1) a first connected cylinder including two or more cylinder liners and a connecting portion configured to connect the two or more cylinder liners to each other or (2) a second connected cylinder including a connected cylinder main body portion having two or more cylinder bores and a coating configured to cover an inner peripheral surface of the connected cylinder main body portion in which the cylinder bores are formed. The cylinder block main body has one end side, another end side, and the hollow portion passing through the cylinder block main body from the one end side to the another end side.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: November 17, 2020
    Assignees: TPR CO., LTD., TPR INDUSTRY CO., LTD.
    Inventors: Masami Horigome, Akira Sato, Takashi Oizumi, Takashi Inoue, Akira Hikone
  • Patent number: 10760687
    Abstract: To fulfill a sealing function for a fluid within a short period of time when a pump configured to pressure-feed the fluid is activated, provided are a seal ring, including: a first side surface (20); a second side surface (30) being a side surface on a side opposite to the first side surface (20); and a first side-surface side projecting portion (40) formed on the first side surface (20), in which a distal end portion (42) of the first side-surface side projecting portion (40) projects most toward an outward side from the first side surface (20) as compared to an entire surface of the first side surface (20) except for the distal end portion (42), and a sealing device using the same.
    Type: Grant
    Filed: March 13, 2017
    Date of Patent: September 1, 2020
    Assignee: TPR CO., LTD.
    Inventors: Hitoshi Yamaguchi, Teppei Oga
  • Patent number: 10763511
    Abstract: A method for producing porous graphite capable of realizing higher durability, output and capacity, and porous graphite. A carbon member having microvoids is obtained by a dealloying step for selectively eluting other non-carbon main components into a metal bath by immersing a carbon-containing material, composed of a compound including carbon or an alloy or non-equilibrium alloy, in the metal bath, wherein the metal bath has a solidifying point lower than the melting point of the carbon-containing material, and is controlled to a temperature lower than the minimum value of a liquidus temperature within a composition fluctuation range extending from the carbon-containing material to carbon by reducing the other non-carbon main components. The carbon member obtained in the dealloying step is graphitized by heating in a graphitization step. The carbon member graphitized in the graphitization step is subjected to activation treatment by an activation step.
    Type: Grant
    Filed: October 23, 2018
    Date of Patent: September 1, 2020
    Assignees: TOHOKU TECHNO ARCH CO., LTD., TPR CO., LTD.
    Inventors: Hidemi Kato, Seung-Geun Yu, Takeshi Wada
  • Publication number: 20200256277
    Abstract: To reduce a friction, and to provide an excellent seizing resistance. Provided is a cast iron cylinder liner including an inner peripheral sliding surface made of cast iron, and an internal combustion engine including a cylinder bore including an inner peripheral sliding surface made of cast iron, wherein the inner peripheral sliding surface includes a region satisfying Expression (1) to Expression (3), Rvk/Rk?1.0 ??Expression (1) 0.08 ?m?Rk?0.3 ?m Expression (2) Rk?Rpk>0 Expression (3) [Rk is the core roughness depth based on JIS B0671-2:2002, Rpk is the reduced peak height based on JIS B0671-2:2002, and Rvk is the reduced valley depth based on JIS B0671-2:2002 in Expression (1) to Expression (3)].
    Type: Application
    Filed: July 5, 2019
    Publication date: August 13, 2020
    Applicants: TPR CO., LTD., TPR INDUSTRY CO., LTD.
    Inventors: Kiyoyuki KAWAI, Shinji AMAIKE, Tetsuya NANGO, Seiji TAMAKI, Seeroku HOSHINO, Wataru SUZUKI, Takashi OIZUMI, Hiroshi YAGUCHI, Takashi SUZUKI